87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
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package autoconf
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"github.com/golang/protobuf/jsonpb"
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"github.com/hashicorp/consul/proto/pbautoconf"
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)
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const (
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// autoConfigFileName is the name of the file that the agent auto-config settings are
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// stored in within the data directory
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autoConfigFileName = "auto-config.json"
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)
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var (
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pbMarshaler = &jsonpb.Marshaler{
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OrigName: false,
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EnumsAsInts: false,
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Indent: " ",
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EmitDefaults: true,
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}
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pbUnmarshaler = &jsonpb.Unmarshaler{
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AllowUnknownFields: false,
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}
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)
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func (ac *AutoConfig) readPersistedAutoConfig() (*pbautoconf.AutoConfigResponse, error) {
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if ac.config.DataDir == "" {
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// no data directory means we don't have anything to potentially load
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return nil, nil
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}
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path := filepath.Join(ac.config.DataDir, autoConfigFileName)
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ac.logger.Debug("attempting to restore any persisted configuration", "path", path)
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content, err := ioutil.ReadFile(path)
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if err == nil {
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rdr := strings.NewReader(string(content))
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var resp pbautoconf.AutoConfigResponse
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if err := pbUnmarshaler.Unmarshal(rdr, &resp); err != nil {
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return nil, fmt.Errorf("failed to decode persisted auto-config data: %w", err)
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}
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ac.logger.Info("read persisted configuration", "path", path)
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return &resp, nil
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}
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if !os.IsNotExist(err) {
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return nil, fmt.Errorf("failed to load %s: %w", path, err)
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}
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// ignore non-existence errors as that is an indicator that we haven't
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// performed the auto configuration before
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return nil, nil
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}
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func (ac *AutoConfig) persistAutoConfig(resp *pbautoconf.AutoConfigResponse) error {
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// now that we know the configuration is generally fine including TLS certs go ahead and persist it to disk.
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if ac.config.DataDir == "" {
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ac.logger.Debug("not persisting auto-config settings because there is no data directory")
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return nil
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}
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serialized, err := pbMarshaler.MarshalToString(resp)
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if err != nil {
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return fmt.Errorf("failed to encode auto-config response as JSON: %w", err)
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}
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path := filepath.Join(ac.config.DataDir, autoConfigFileName)
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err = ioutil.WriteFile(path, []byte(serialized), 0660)
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if err != nil {
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return fmt.Errorf("failed to write auto-config configurations: %w", err)
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}
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ac.logger.Debug("auto-config settings were persisted to disk")
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return nil
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}
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